790 The American Naturalist. [September, 
In the freshly hatched larva of Hepialus mustelinus 1.3 mm. 
in length, the head is no wider than the prothoracie segment, 
whose dorsal plate is well developed. The mouthparts are 
quite large, especially the spinneret, while the hairs which are 
acute at the end, are in this stage as long as the body is broad. 
The abdominal legs appear to have at this stage only ten 
-crochets, or at least very few. 
